a
- Increase in encoding level.
The Encoding level. Leader/17 of the
record has been changed from code
o (incomplete) to
code n (complete). c
- Corrected or revised.
A change other than to the encoding level code has been made to the
record. d
- Deleted.
The delete code used when neither code s
nor code x is applicable. n
- New.o
- Obsolete.s
- Deleted. Heading is split into two or more headings.x
- Deleted. Heading replaced by another heading.

06
- Type of record. Indicates the characteristics of and defines the
components of the
record.